adjective Chemistry.

  1. containing two replaceable or ionizable hydrogen atoms: dibasic acid.
  2. having two univalent, basic atoms, as dibasic sodium phosphate, Na2HPO4.


  1. (of an acid, such as sulphuric acid, H 2 SO 4) containing two acidic hydrogen atomsCompare diacidic
  2. (of a salt) derived by replacing two acidic hydrogen atomsdibasic sodium phosphate, Na 2 HPO 4


  1. Containing two replaceable hydrogen atoms.
  2. Of or relating to salts or acids forming salts with two atoms of a univalent metal.

  1. Relating to an acid that contains two hydrogen atoms that can be replaced by metal ions. Sulfuric acid (H2SO4) is a dibasic acid. The hydrogens can be replaced by sodium and hydrogen to form sodium hydrogen sulfate (NaHSO4) or by two sodium atoms to form sodium sulfate (Na2SO4).
  2. Relating to a compound that contains two basic monovalent groups or atoms.
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